Wikipedia:Main Page history/2011 October 23

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Today's featured article
Calabozos is a Holocene caldera in the Maule Region in central Chile. Part of the Chilean Andes' volcanic segment, it is considered a member of the Southern Volcanic Zone. This most active section of the Andes runs through central and western Chile, and includes more than 70 of Chile's stratovolcanoes and volcanic fields. Calabozos and the majority of the Andean volcanoes formed from the subduction of the oceanic Nazca Plate under the continental South American continental lithosphere. The caldera is in a transitional region between thick and thin lithosphere, and is probably supplied by a pool of andesitic and rhyolitic magma. It sits on a historic bed of volcanic and plutonic sedimentary rock that in turn sits on top of a layer of merged sedimentary and metamorphic rock. Calabozos is responsible for the huge Loma Seca Tuff, a body of material 200 to 500 cubic kilometres (48 to 120 cu mi) in volume. It accumulated over at least three eruptive periods, beginning 800,000 years ago and lasting until 150,000 years ago. The caldera's dimensions are 26 by 14 kilometres (16 by 9 mi), and it has an elevation of 3,508 metres (11,509 ft). (more...) Recently featured: Liberal Movement – Henry Wood – Abdul Karim Archive – By email – More featured articles...
Did you know...
From Wikipedia's newest content: ... that the Pythagorean tiling, a pattern of squares of two sizes that can be used to prove the Pythagorean theorem, appears in a painting (pictured) by Dutch Golden Age artist Jacob Ochtervelt? ... that in July 1946, the 6th Airborne Division placed a cordon around Tel Aviv and searched every building looking for those responsible for the King David Hotel bombing? ... that Atomatrix, who will skate for Team USA at the Roller Derby World Cup, has competed at the international level in inline and ice speed skating? ... that Mexican singer-songwriter Espinoza Paz did not want to release his album Canciones Que Duelen but was persuaded by his record label to do so? ... that the redfruit desertparsley is a wild carrot found only on the Blue Mountains of Oregon? ... that in his last professional baseball season, Harry Suter set the Pacific Coast League single-game strikeout record? ... that players in the upcoming first person video game Warco will shoot camera footage, not bullets? Archive – Start a new article – Nominate an article

In the news
Prince Sultan bin Abdul-Aziz Al Saud The Rugby World Cup concludes with New Zealand defeating France in Auckland. Saudi Crown Prince Sultan bin Abdul-Aziz Al Saud (pictured) dies in New York. Basque separatist group ETA announces a cessation of armed activity. Ousted Libyan leader Muammar Gaddafi is killed in Sirte, with National Transitional Council forces taking control of the city. After five years in captivity, Israeli soldier Gilad Shalit is freed in exchange for the release of 1,027 Palestinian prisoners. British writer Julian Barnes wins the Man Booker Prize for his novel The Sense of an Ending. Wikinews – Recent deaths – More current events...
On this day...
October 23: National Day in Hungary (1956); Mole Day 1641 – Irish Catholic gentry in Ulster tried to seize control of Dublin Castle, the seat of English rule in Ireland to force concessions to Catholics. 1850 – The first National Women's Rights Convention was held in Worcester, Massachusetts, US, to further the cause of women's rights. 1956 – The Hungarian Revolution began as a peaceful student demonstration which attracted thousands as it marched through central Budapest to the Parliament building. 1983 – Lebanese Civil War: Suicide bombers destroyed two barracks in Beirut, Lebanon, killing 241 U.S. servicemen and 58 French paratroopers of the international peacekeeping force. 2001 – The iPod (pictured), the line of portable media players designed and marketed by Apple, was launched. More anniversaries: October 22 – October 23 – October 24 Archive – By email – List of historical anniversaries It is now October 23, 2011 (UTC) – Refresh this page

Today's featured picture

A Swamp Wallaby (Wallabia bicolor) joey. The Swamp Wallaby is found along the entire east coast of Australia. It was formerly found through to south-eastern South Australia, but is now rare or absent from that region. It inhabits thick undergrowth in forests and woodlands, or shelter during the day in thick grass or ferns, emerging at night to feed.

Photo: Benjamint444

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